On October 1, 2015, the U.S. Environmental Protection Agency (EPA) announced a new eight-hour standard of 70 ppb for ground-level ozone, one of the principal components of smog. Read more about the new standard. Learn more about the U.S. EPA’s regulatory actions for making designations for the 2015 ozone standard here.

Santa Barbara County

The EPA determines whether an area is considered in attainment of the federal eight-hour ozone standard based on the fourth highest level of ozone recorded at monitoring stations in a three-year period. In April 2018, the EPA designated Santa Barbara County as “Attainment/Unclassifiable” for this new standard. The county is currently classified as “nonattainment-transitional” for the state ozone standard.

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